Discussion Starter · #1 ·
I've got about 7100 miles on my truck now, and when I drop it off for service on Friday, I'll have them refill my DEF blue which is under about an 1/8th as shown on the gauge. This will be my second refill. I'd say about 75% of the miles I've done have been highway -- I'm curious as to what others are seeing in terms of DEF usage. I've probably done about 1000 miles max of towing in this (8x4 U-Haul, lightly loaded).